CPC F02C 6/18 (2013.01) [F01K 23/10 (2013.01); F02C 7/12 (2013.01); F02C 7/141 (2013.01); F02C 7/224 (2013.01)] | 17 Claims |
1. A combined power generation system comprising:
a gas turbine configured to combust fuel to generate a rotational force;
a heat recovery steam generator (HRSG) configured to heat feedwater using combustion gas discharged from the gas turbine and include a high-pressure section, a medium-pressure section, and a low-pressure section with different pressure levels;
a fuel preheater configured to heat fuel supplied to the gas turbine and include a primary heating part and a secondary heating part;
a high-pressure feedwater supply pipe connected to the high-pressure section to supply high-pressure feedwater to the fuel preheater;
a feedwater transfer pipe connecting the secondary heating part and the primary beating part to supply feedwater discharged from the secondary heating part to the primary beating part; and
a first feedwater control pipe connected to supply first medium-pressure feedwater to the feedwater transfer pipe, and
wherein the medium-pressure section includes a medium-pressure pump pressurizing and supplying the feedwater, a medium-pressure economizer receiving the feedwater from the medium-pressure pump and heating the received feedwater,
wherein the first feedwater control pipe is connected between the medium pressure pump and the medium-pressure economizer of the medium-pressure section,
wherein the high-pressure feedwater consists of liquid, and a phase of the high-pressure feedwater in the fuel preheater does not change and maintains a liquid state.
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